PDF malware analysis — malicious · 3e543e950bb72991

MALICIOUS

PDF

5.2 KB

MD5: 2af919c7f59ea9c84d5261a100063b9d SHA-1: 7ca3f5401a659109f10527fefb0234f037048e75 SHA-256: 3e543e950bb72991b3690b0a18fbd919a7faa45cfae7b0e2df8b8931583418a7

158 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

This PDF document contains embedded JavaScript that leverages the CVE-2008-2992 vulnerability in Adobe Reader. The JavaScript is heavily obfuscated and uses a custom Base64 decoder to unpack further layers of code. The ultimate goal appears to be the execution of a second-stage payload, as indicated by the 'eval()' calls and the ML classifier's high confidence score.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 6

util.printf — CVE-2008-2992 critical CVE exact CVE_2008_2992

PDF JavaScript calls util.printf() — CVE-2008-2992 is a stack buffer overflow in Adobe Reader triggered by a long format-specifier argument. Widely exploited in the wild after disclosure. (identified after JavaScript deobfuscation)
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
JavaScript action low PDF_JAVASCRIPT

PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
String.fromCharCode low PDF_FROMCHARCODE

String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape rules. (matched inside decoded stream)
Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE

One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0013_001.js` `90335baccd1fbea0843c6bd358217c8a63a80d09c15c45cd41c4ac29ef104c37`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	9226 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 7 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`custom_b64_stage_000.js` `390e4f918e6717abcfd76fdc77cafdbcd871164ebdbd588bcef1a5dc2d7d69f1`	deobfuscated-js	custom Base64 decoded JavaScript layer 3 (PDF /JS object 13) at offset 0xDD0	2046 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

Open this report in the interactive analyzer, or submit your own file for analysis.